Amorphous High-Surface-Area Aluminum Hydroxide-Bicarbonates for Highly Efficient Methyl Orange Removal from Water.

Amorphous high-surface-area aluminum hydroxide-bicarbonates were synthesized starting from AlCl, base, and bicarbonate in water. Composites with a chemical formulas of [AlO(μ-OH)(HO)(OH)](HCO) () and [AlO(μ-OH)(HO)(OH)](HCO) () were obtained by the use of NaOH/NaHCO and NH/NHHCO as base/bicarbonate, respectively. The surface area of the composites was highly dependent on the pH level of the synthetic solution, and composites with high surface areas (ca.

Ruthenium(II)-Bipyridine/NanoC N Hybrids: Tunable Photochemical Properties by Using Exchangeable Alkali Metal Cations.

A series of nanoporous carbon nitrides that contained a range of alkali metal cations (M@nanoC N : M=Li , Na , K , Rb , and Cs ) have been successfully synthesized from as-synthesized g-C N by delamination with concentrated sulfuric acid, followed by neutralization with aqueous solutions of the corresponding alkali metal hydroxides. Tris(2,2'-bipyridine)ruthenium(II) complexes, [Ru(bpy) ] , were grafted onto the carbon nitrides in an effort to explore the physicochemical properties of the deposited [Ru(bpy) ] , as well as its photocatalytic activity in the aerobic photooxidation of phenylboronic acid and H production from aqueous media in the presence of a Pt co-catalyst under visible-light irradiation. Highly porous nanoC N could significantly enhance photocatalytic activity, because of its high surface area, owing to its unique porous structure.

Reversible Generation of Labile Secondary Carbocations from Alcohols in the Nanospace of H-Mordenite and Their Long-Lasting Preservation at Ambient Temperature.

Secondary carbocations are rarely observed spectrometrically for prolonged durations at ambient temperatures because of their instability. In this study, when 4,4'-difluorobenzhydrol (1) was mixed with H-mordenite (H-Mor), the 4,4'-difluorodiphenylmethyl cation (2) was generated as the main product, identified by UV-vis and C-MAS NMR spectroscopies, and was preserved for over 1 week at ambient temperature. Surprisingly, the polymerization and disproportionation of 1 barely proceeded within the micropores of H-Mor.

Nickel-supported carbon nitride photocatalyst combined with organic dye for visible-light-driven hydrogen evolution from water.

A noble-metal-free photocatalytic H2 production system consisting of a Ni-based catalyst, visible-light-responsive organic dye, and graphitic carbon nitride (g-C3N4) as a support has been developed. Characterization by means of XAFS revealed that the deposition of a trinuclear Ni precursor complex, Ni(NiL2)2Cl2 (L = β-mercaptoethylamine), on the g-C3N4 affords a monomeric Ni(ii) species involving β-mercaptoethylamine and aqua ligands in an octahedral coordination geometry. Such a Ni species acts as a hydrogen production site from an aqueous solution without an electron relay reagent by combining with thiazole orange (TO) as a photosensitizer.